// Check A record as fallback $records = dns_get_record($domain, DNS_A); return !empty($records); 1. Validate Against SMTP Server (No Email Sent) function smtpDomainValidation($email) $domain = substr(strrchr($email, "@"), 1); // Get MX records getmxrr($domain, $mx_records);
// Connect to SMTP server $connection = @fsockopen($mx_host, 25, $errno, $errstr, 10);
1. Check DNS Records (MX & A) The most reliable method – verify if the domain can receive emails: validate email domain php
// Fallback: Check A record if no MX exists if (checkdnsrr($domain, "A")) return true;
// Usage $email = "user@gmail.com"; if (validateEmailDomain($email)) echo "Valid domain!"; else echo "Invalid or non-existent domain."; // Check A record as fallback $records =
if (!$connection) return false;
// Use the mail exchanger with highest priority $mx_host = $mx_records[0]; // Get MX records getmxrr($domain
function validateEmailFormat($email) return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;